Error 'Array indices must be positive integers or logical values.' when the number of indices is large

Hi all,

I have two vectors:

• p of size 32x1,
• b of size 300000x1. Value range of elements of b is [1, 32].

I want to assign

a = p(b)

And I got error: Array indices must be positive integers or logical values.

It was fine when I tried

a = p(b(1:40000)

However, MATLAB releases the error again with

a = p(b(1:50000)

Do you have any ideas on what problem that I encounted? Any help you have to offer would be greatly appreciated.

Answer 1

[madhan ravi]

In this case it’s probable that b has elements less than 1 and greater than 32.

 Outside_bounds = nnz((b < 1) | (b > 32)) % to check

[Soan Duong]

Thanks @madhan for your comment.

Yes, there are some elements of b equal to 0.

I have fixed the problem and it works now.